While chasing a germ that thinks its cuteness will protect it, U-1146 meets Backward-Cap, a novice platelet who aims to become stronger. A sudden incident in the temple's area causes a breaking of capillaries, and the platelets must stop the internal hemorrhage, with some coaxing from Megakaryocyte (cell that produces platelets). Megakaryocyte at first berates them for being weak, then motivates them by offering medals. The platelets form human chains to reach across the injury and seal it with a clot.

Memory Cell sees a dream where the arrival of messengers from the outside signal the end of this world - As if his dream became reality, unidentified enemies enter the body. Will this world be ruined as Memory Cell predicts?

Toxic reaction found on the epidermis. Mast Cell does her job according to the manual, but complaints pour in from other cells that are annoyed by her actions. Mast Cell loses her cool and unleashes her rage.

An incident has occurred in the body. The Immune Cells rush to the scene and fight the cells infected by a virus. A group of mysterious bacteria appear in front of the Ordinary Cell and.

Ordinary Cell heads to the intestines with White Blood Cell (Neutrophil) in search of the lactic acid bacteria. Ordinary Cell desperately searches for the lactic acid bacterium but is attacked by cells infected by a new virus.

The antibody information of a cell has leaked. In the intestine, which has been irritated due to toxic gas being released by harmful bacteria, the group meets up with Memory T Cell who was formerly known as "Killer T Cell".

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